Codebase update and improvements, instruction DB update

* Denested src folder to root, renamed testing to asmjit-testing

  * Refactored how headers are included into <asmjit/...> form. This
    is necessary as compilers would never simplify a path once a ..
    appears in include directory - then paths such as ../core/../core
    appeared in asserts, which was ugly

  * Moved support utilities into asmjit/support/... (still included
    by asmjit/core.h for convenience and compatibility)

  * Added CMakePresets.json for making it easy to develop AsmJit

  * Reworked CMakeLists to be shorter and use CMake option(),
    etc... This simplifies it and makes it using more standard
    features

  * ASMJIT_EMBED now creates asmjit_embed INTERFACE library,
    which is accessible via asmjit::asmjit target - this simplifies
    embedding and makes it the same as library targets from a CMake
    perspective

  * Removed ASMJIT_DEPS - this is now provided by cmake target
    aliases - 'asmjit::asmjit' so users should not need this variable

  * Changed meaning of ASMJIT_LIBS - this now contains only AsmJit
    dependencies without asmjit::asmjit target alias. Don't rely on
    ASMJIT_LIBS anymore as it's only used internally

  * Removed ASMJIT_NO_DEPRECATED option - AsmJit is not going
    to provide controllable deprecations in the future

  * Removed ASMJIT_NO_VALIDATION in favor of ASMJIT_NO_INTROSPECTION,
    which now controls query, features, and validation API presence

  * Removed ASMJIT_DIR option - it was never really needed

  * Removed AMX_TRANSPOSE feature from instruction database (X86).
    Intel has removed it as well, so it's a feature that won't
    be siliconized

asmjit-testing/tests/asmjit_test_assembler.h

@@ -0,0 +1,109 @@
+// This file is part of AsmJit project <https://asmjit.com>
+//
+// See <asmjit/core.h> or LICENSE.md for license and copyright information
+// SPDX-License-Identifier: Zlib
+
+#ifndef ASMJIT_TEST_ASSEMBLER_H_INCLUDED
+#define ASMJIT_TEST_ASSEMBLER_H_INCLUDED
+
+#include <asmjit/core.h>
+
+#include <stdio.h>
+
+struct TestSettings {
+  bool verbose;
+  bool validate;
+};
+
+template<typename AssemblerType>
+class AssemblerTester {
+public:
+  asmjit::Environment env {};
+  asmjit::CodeHolder code {};
+  AssemblerType assembler {};
+  asmjit::Label L0 {};
+  const TestSettings& settings;
+
+  size_t passed {};
+  size_t count {};
+
+  AssemblerTester(asmjit::Arch arch, const TestSettings& settings) noexcept
+    : env(arch),
+      settings(settings) {
+    prepare();
+  }
+
+  void print_header(const char* arch_name) noexcept {
+    printf("%s assembler tests:\n", arch_name);
+  }
+
+  void print_summary() noexcept {
+    printf("  Passed: %zu / %zu tests\n\n", passed, count);
+  }
+
+  bool did_pass() const noexcept { return passed == count; }
+
+  void prepare() noexcept {
+    code.reset();
+    code.init(env, 0);
+    code.attach(&assembler);
+    L0 = assembler.new_label();
+
+    if (settings.validate)
+      assembler.add_diagnostic_options(asmjit::DiagnosticOptions::kValidateAssembler);
+  }
+
+  ASMJIT_NOINLINE bool test_valid_instruction(const char* s, const char* expected_opcode, asmjit::Error err = asmjit::Error::kOk) noexcept {
+    count++;
+
+    if (err != asmjit::Error::kOk) {
+      printf("  !! %s\n"
+             "    <%s>\n", s, asmjit::DebugUtils::error_as_string(err));
+      prepare();
+      return false;
+    }
+
+    asmjit::String encoded_opcode;
+    asmjit::Section* text = code.text_section();
+
+    encoded_opcode.append_hex(text->data(), text->buffer_size());
+    if (encoded_opcode != expected_opcode) {
+      printf("  !! [%s] <- %s\n"
+             "     [%s] (Expected)\n", encoded_opcode.data(), s, expected_opcode);
+      prepare();
+      return false;
+    }
+
+    if (settings.verbose)
+      printf("  OK [%s] <- %s\n", encoded_opcode.data(), s);
+
+    passed++;
+    prepare();
+    return true;
+  }
+
+  ASMJIT_NOINLINE bool test_invalid_instruction(const char* s, asmjit::Error expected_error, asmjit::Error err) noexcept {
+    count++;
+
+    if (err == asmjit::Error::kOk) {
+      printf("  !! %s passed, but should have failed with <%s> error\n", s, asmjit::DebugUtils::error_as_string(expected_error));
+      prepare();
+      return false;
+    }
+
+    if (err != asmjit::Error::kOk) {
+      printf("  !! %s failed with <%s>, but should have failed with <%s>\n", s, asmjit::DebugUtils::error_as_string(err), asmjit::DebugUtils::error_as_string(expected_error));
+      prepare();
+      return false;
+    }
+
+    if (settings.verbose)
+      printf("  OK [%s] <- %s\n", asmjit::DebugUtils::error_as_string(err), s);
+
+    passed++;
+    prepare();
+    return true;
+  }
+};
+
+#endif // ASMJIT_TEST_ASSEMBLER_H_INCLUDED