[x86][inline-asm]Allow a pack of Control Debug to be properly picked

[coby]

Summary

Allows the incorporation of legit (x86) Debug Regs within inline asm stataements

[rnk]

lgtm

cfe/trunk/lib/Basic/Targets/X86.cpp

static const char *const GCCRegNames[] = {
     "ymm18", "ymm19", "ymm20", "ymm21", "ymm22",   "ymm23", "ymm24", "ymm25",
     "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",
 };
 
 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},

cfe/trunk/test/CodeGen/ms-inline-asm.c

__asm {
     mov cr0, eax
     mov cr2, ebx
     mov cr3, ecx
     mov cr4, edx
   }
   // CHECK: call void asm sideeffect inteldialect "mov cr0, eax\0A\09mov cr2, ebx\0A\09mov cr3, ecx\0A\09mov cr4, edx", "~{cr0},~{cr2},~{cr3},~{cr4},~{dirflag},~{fpsr},~{flags}"()
 }
 
+void t45() {
+  // CHECK-LABEL: define void @t45
+  __asm {
+    mov dr0, eax
+    mov dr1, ebx
+    mov dr2, ebx
+    mov dr3, ecx
+    mov dr6, edx
+    mov dr7, ecx
+  }
+  // CHECK: call void asm sideeffect inteldialect "mov dr0, eax\0A\09mov dr1, ebx\0A\09mov dr2, ebx\0A\09mov dr3, ecx\0A\09mov dr6, edx\0A\09mov dr7, ecx", "~{dr0},~{dr1},~{dr2},~{dr3},~{dr6},~{dr7},~{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, $$3[ebx].4", "~{eax},~{dirflag},~{fpsr},~{flags}"
 }
 
 void call_clobber() {
   __asm call t41