* Renamed all eq() methods to equals() (consistency) (ABI)
* Reorganized some X86 instructions in X86 database
* Properly detect RISC-V CPU at compile time (Environment)
* Removed CallConvId::kNone in favor of defaulting to kCDecl (ABI)
* CallConvId::kHost is now alias to CallConvId::kCDecl (ABI)
* Added FloatABI to Environment to disginguish between softfloat
and hardfloat
* Added more AArch64 CPU features and their detection (ABI)
* Because of CallConvId changes it's now possible to run
compiler tests on 32-bit ARM (fixes a bug in test cases)
* Added QEMU to CI build matrix to test different architectures