Multiversion on x86-64

Author: mikolaj-pirog

llvm/include/llvm/TargetParser/X86TargetParser.def

@@ -185,6 +185,7 @@ X86_FEATURE_COMPAT(ENQCMD,             "enqcmd",                 0, 48)
 X86_FEATURE_COMPAT(F16C,               "f16c",                   0, 49)
 X86_FEATURE_COMPAT(FSGSBASE,           "fsgsbase",               0, 50)
 X86_FEATURE_COMPAT(SAHF,               "sahf",                   0, 54)
+X86_FEATURE_COMPAT(64BIT,              "64bit",                  0, 55) // Also known as "LM"
 X86_FEATURE_COMPAT(LWP,                "lwp",                    0, 56)
 X86_FEATURE_COMPAT(LZCNT,              "lzcnt",                  0, 57)
 X86_FEATURE_COMPAT(MOVBE,              "movbe",                  0, 58)
@@ -252,7 +253,6 @@ X86_FEATURE       (NF,                 "nf")
 X86_FEATURE       (CF,                 "cf")
 X86_FEATURE       (AVX5124VNNIW,       "avx5124vnniw")
 X86_FEATURE       (AVX5124FMAPS,       "avx5124fmaps")
-X86_FEATURE       (64BIT,              "64bit")
 X86_FEATURE       (CMPXCHG8B,          "cx8")
 X86_FEATURE       (CRC32,              "crc32")
 X86_FEATURE       (INVPCID,            "invpcid")