Reapply r372285 "GlobalISel: Don't materialize immarg arguments to intrinsics"

This reverts r372314, reapplying r372285 and the commits which depend
on it (r372286-r372293, and r372296-r372297)

This was missing one switch to getTargetConstant in an untested case.

llvm-svn: 372338
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyInstrBulkMemory.td b/llvm/lib/Target/WebAssembly/WebAssemblyInstrBulkMemory.td
index f4352e3..05735cf 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyInstrBulkMemory.td
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyInstrBulkMemory.td
@@ -39,7 +39,7 @@
          (ins i32imm_op:$seg, i32imm_op:$idx, I32:$dest,
               I32:$offset, I32:$size),
          (outs), (ins i32imm_op:$seg, i32imm_op:$idx),
-         [(int_wasm_memory_init (i32 imm:$seg), (i32 imm:$idx), I32:$dest,
+         [(int_wasm_memory_init (i32 timm:$seg), (i32 timm:$idx), I32:$dest,
             I32:$offset, I32:$size
           )],
          "memory.init\t$seg, $idx, $dest, $offset, $size",
@@ -48,7 +48,7 @@
 let hasSideEffects = 1 in
 defm DATA_DROP :
   BULK_I<(outs), (ins i32imm_op:$seg), (outs), (ins i32imm_op:$seg),
-         [(int_wasm_data_drop (i32 imm:$seg))],
+         [(int_wasm_data_drop (i32 timm:$seg))],
          "data.drop\t$seg", "data.drop\t$seg", 0x09>;
 
 let mayLoad = 1, mayStore = 1 in