Register NetBSD/x86_64 in MemorySanitizer.cpp

[krytarowski]

Summary

Reuse the Linux new mapping as it is.

Sponsored by <The NetBSD Foundation>

lib/Transforms/Instrumentation/MemorySanitizer.cpp

 // x86_64 FreeBSD
 static const MemoryMapParams FreeBSD_X86_64_MemoryMapParams = {
   0xc00000000000,  // AndMask
   0x200000000000,  // XorMask
   0x100000000000,  // ShadowBase
   0x380000000000,  // OriginBase
 };
 
+// x86_64 NetBSD
+static const MemoryMapParams NetBSD_X86_64_MemoryMapParams = {
+  0,               // AndMask
+  0x500000000000,  // XorMask
+  0,               // ShadowBase
+  0x100000000000,  // OriginBase
+};
+
 static const PlatformMemoryMapParams Linux_X86_MemoryMapParams = {
   &Linux_I386_MemoryMapParams,
   &Linux_X86_64_MemoryMapParams,
 };
 
 static const PlatformMemoryMapParams Linux_MIPS_MemoryMapParams = {
   nullptr,
   &Linux_MIPS64_MemoryMapParams,
static const PlatformMemoryMapParams Linux_ARM_MemoryMapParams = {
   &Linux_AArch64_MemoryMapParams,
 };
 
 static const PlatformMemoryMapParams FreeBSD_X86_MemoryMapParams = {
   &FreeBSD_I386_MemoryMapParams,
   &FreeBSD_X86_64_MemoryMapParams,
 };
 
+static const PlatformMemoryMapParams NetBSD_X86_MemoryMapParams = {
+  nullptr,
+  &NetBSD_X86_64_MemoryMapParams,
+};
+
 namespace {
 
 /// \brief An instrumentation pass implementing detection of uninitialized
 /// reads.
 ///
 /// MemorySanitizer: instrument the code in module to find
 /// uninitialized reads.
 class MemorySanitizer : public FunctionPass {
case Triple::FreeBSD:
           break;
         case Triple::x86:
           MapParams = FreeBSD_X86_MemoryMapParams.bits32;
           break;
         default:
           report_fatal_error("unsupported architecture");
       }
       break;
+    case Triple::NetBSD:
+      switch (TargetTriple.getArch()) {
+        case Triple::x86_64:
+          MapParams = NetBSD_X86_MemoryMapParams.bits64;
+          break;
+        default:
+          report_fatal_error("unsupported architecture");
+      }
+      break;
     case Triple::Linux:
       switch (TargetTriple.getArch()) {
         case Triple::x86_64:
           MapParams = Linux_X86_MemoryMapParams.bits64;
           break;
         case Triple::x86:
           MapParams = Linux_X86_MemoryMapParams.bits32;
           break;