[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

Essentially the same as the GEP change in r230786.

A similar migration script can be used to update test cases, though a few more
test case improvements/changes were required this time around: (r229269-r229278)

import fileinput
import sys
import re

pat = re.compile(r"((?:=|:|^)\s*load (?:atomic )?(?:volatile )?(.*?))(| addrspace\(\d+\) *)\*($| *(?:%|@|null|undef|blockaddress|getelementptr|addrspacecast|bitcast|inttoptr|\[\[[a-zA-Z]|\{\{).*$)")

for line in sys.stdin:
  sys.stdout.write(re.sub(pat, r"\1, \2\3*\4", line))

Reviewers: rafael, dexonsmith, grosser

Differential Revision: http://reviews.llvm.org/D7649

llvm-svn: 230794
diff --git a/llvm/test/CodeGen/R600/fp32_to_fp16.ll b/llvm/test/CodeGen/R600/fp32_to_fp16.ll
index c3c65ae..67925eb 100644
--- a/llvm/test/CodeGen/R600/fp32_to_fp16.ll
+++ b/llvm/test/CodeGen/R600/fp32_to_fp16.ll
@@ -8,7 +8,7 @@
 ; SI: v_cvt_f16_f32_e32 [[RESULT:v[0-9]+]], [[VAL]]
 ; SI: buffer_store_short [[RESULT]]
 define void @test_convert_fp32_to_fp16(i16 addrspace(1)* noalias %out, float addrspace(1)* noalias %in) nounwind {
-  %val = load float addrspace(1)* %in, align 4
+  %val = load float, float addrspace(1)* %in, align 4
   %cvt = call i16 @llvm.convert.to.fp16.f32(float %val) nounwind readnone
   store i16 %cvt, i16 addrspace(1)* %out, align 2
   ret void