[WebAssembly] Add type prefixes to call instructions

Add return type information to call and call_indirect instructions. This
allows them to be disambiguated without knowledge of the callee.

Differential Revision: http://reviews.llvm.org/D15484

llvm-svn: 255565
diff --git a/llvm/test/CodeGen/WebAssembly/f32.ll b/llvm/test/CodeGen/WebAssembly/f32.ll
index 10fe185..7770100 100644
--- a/llvm/test/CodeGen/WebAssembly/f32.ll
+++ b/llvm/test/CodeGen/WebAssembly/f32.ll
@@ -146,7 +146,7 @@
 }
 
 ; CHECK-LABEL: fma32:
-; CHECK: call $push0=, fmaf, $0, $1, $2{{$}}
+; CHECK: {{^}} f32.call $push0=, fmaf, $0, $1, $2{{$}}
 ; CHECK-NEXT: return $pop0{{$}}
 define float @fma32(float %a, float %b, float %c) {
   %d = call float @llvm.fma.f32(float %a, float %b, float %c)