[x86][inline-asm] allow recognition of MPX regs inside ms inline-asm blob

[coby]

Reid,
can you please have a look?

[rnk]

Looks good, thanks for the heads up

lib/Basic/Targets/X86.cpp

static const char *const GCCRegNames[] = {
     "ymm26", "ymm27", "ymm28", "ymm29", "ymm30",   "ymm31", "zmm0",  "zmm1",
     "zmm2",  "zmm3",  "zmm4",  "zmm5",  "zmm6",    "zmm7",  "zmm8",  "zmm9",
     "zmm10", "zmm11", "zmm12", "zmm13", "zmm14",   "zmm15", "zmm16", "zmm17",
     "zmm18", "zmm19", "zmm20", "zmm21", "zmm22",   "zmm23", "zmm24", "zmm25",
     "zmm26", "zmm27", "zmm28", "zmm29", "zmm30",   "zmm31", "k0",    "k1",
     "k2",    "k3",    "k4",    "k5",    "k6",      "k7",
     "cr0",   "cr2",   "cr3",   "cr4",   "cr8",
     "dr0",   "dr1",   "dr2",   "dr3",   "dr6",     "dr7",
+    "bnd0",  "bnd1",  "bnd2",  "bnd3",
 };
 
 const TargetInfo::AddlRegName AddlRegNames[] = {
     {{"al", "ah", "eax", "rax"}, 0},
     {{"bl", "bh", "ebx", "rbx"}, 3},
     {{"cl", "ch", "ecx", "rcx"}, 2},
     {{"dl", "dh", "edx", "rdx"}, 1},
     {{"esi", "rsi"}, 4},

test/CodeGen/ms-inline-asm.c

 }
 
 void t46() {
   // CHECK-LABEL: define void @t46
   __asm add eax, -128[eax]
   // CHECK: call void asm sideeffect inteldialect "add eax, [eax + $$-128]", "~{eax},~{flags},~{dirflag},~{fpsr},~{flags}"()
 }
 
+void t47() {
+  // CHECK-LABEL: define void @t47
+  __asm {
+    bndmk bnd0, dword ptr [eax]
+    bndmk bnd1, dword ptr [ebx]
+    bndmk bnd2, dword ptr [ecx]
+    bndmk bnd3, dword ptr [edx]
+  }
+  // CHECK: call void asm sideeffect inteldialect "bndmk bnd0, dword ptr [eax]\0A\09bndmk bnd1, dword ptr [ebx]\0A\09bndmk bnd2, dword ptr [ecx]\0A\09bndmk bnd3, dword ptr [edx]", "~{bnd0},~{bnd1},~{bnd2},~{bnd3},~{dirflag},~{fpsr},~{flags}"()
+}
+
 void dot_operator(){
   // CHECK-LABEL: define void @dot_operator
   __asm { mov eax, 3[ebx]A.b}
   // CHECK: call void asm sideeffect inteldialect "mov eax, [ebx + $$7]", "~{eax},~{dirflag},~{fpsr},~{flags}"
 }
 
 void call_clobber() {
   __asm call t41