[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/llvm.amdgpu.dp4.ll b/llvm/test/CodeGen/R600/llvm.amdgpu.dp4.ll
index 812b6a4..036cd2c 100644
--- a/llvm/test/CodeGen/R600/llvm.amdgpu.dp4.ll
+++ b/llvm/test/CodeGen/R600/llvm.amdgpu.dp4.ll
@@ -3,8 +3,8 @@
 declare float @llvm.AMDGPU.dp4(<4 x float>, <4 x float>) nounwind readnone
 
 define void @test_dp4(float addrspace(1)* %out, <4 x float> addrspace(1)* %a, <4 x float> addrspace(1)* %b) nounwind {
-  %src0 = load <4 x float> addrspace(1)* %a, align 16
-  %src1 = load <4 x float> addrspace(1)* %b, align 16
+  %src0 = load <4 x float>, <4 x float> addrspace(1)* %a, align 16
+  %src1 = load <4 x float>, <4 x float> addrspace(1)* %b, align 16
   %dp4 = call float @llvm.AMDGPU.dp4(<4 x float> %src0, <4 x float> %src1) nounwind readnone
   store float %dp4, float addrspace(1)* %out, align 4
   ret void