[WebAssembly] Add new explicit relocation types for PIC relocations

See https://github.com/WebAssembly/tool-conventions/pull/106

Differential Revision: https://reviews.llvm.org/D59907

llvm-svn: 357710
diff --git a/llvm/lib/MC/MCExpr.cpp b/llvm/lib/MC/MCExpr.cpp
index 749c323..fe14272 100644
--- a/llvm/lib/MC/MCExpr.cpp
+++ b/llvm/lib/MC/MCExpr.cpp
@@ -302,7 +302,9 @@
   case VK_Hexagon_LD_PLT: return "LDPLT";
   case VK_Hexagon_IE: return "IE";
   case VK_Hexagon_IE_GOT: return "IEGOT";
-  case VK_WebAssembly_TYPEINDEX: return "TYPEINDEX";
+  case VK_WASM_TYPEINDEX: return "TYPEINDEX";
+  case VK_WASM_MBREL: return "MBREL";
+  case VK_WASM_TBREL: return "TBREL";
   case VK_AMDGPU_GOTPCREL32_LO: return "gotpcrel32@lo";
   case VK_AMDGPU_GOTPCREL32_HI: return "gotpcrel32@hi";
   case VK_AMDGPU_REL32_LO: return "rel32@lo";
@@ -415,7 +417,9 @@
     .Case("lo8", VK_AVR_LO8)
     .Case("hi8", VK_AVR_HI8)
     .Case("hlo8", VK_AVR_HLO8)
-    .Case("typeindex", VK_WebAssembly_TYPEINDEX)
+    .Case("typeindex", VK_WASM_TYPEINDEX)
+    .Case("tbrel", VK_WASM_TBREL)
+    .Case("mbrel", VK_WASM_MBREL)
     .Case("gotpcrel32@lo", VK_AMDGPU_GOTPCREL32_LO)
     .Case("gotpcrel32@hi", VK_AMDGPU_GOTPCREL32_HI)
     .Case("rel32@lo", VK_AMDGPU_REL32_LO)