[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/PowerPC/pr17168.ll b/llvm/test/CodeGen/PowerPC/pr17168.ll
index 62a9ede..af50703 100644
--- a/llvm/test/CodeGen/PowerPC/pr17168.ll
+++ b/llvm/test/CodeGen/PowerPC/pr17168.ll
@@ -24,7 +24,7 @@
 
 for.end1042:                                      ; preds = %for.cond968.preheader, %for.cond964.preheader, %entry
   %0 = phi i32 [ undef, %for.cond964.preheader ], [ undef, %for.cond968.preheader ], [ undef, %entry ]
-  %1 = load i32* getelementptr inbounds ([3 x i32]* @grid_points, i64 0, i64 0), align 4, !dbg !443, !tbaa !444
+  %1 = load i32, i32* getelementptr inbounds ([3 x i32]* @grid_points, i64 0, i64 0), align 4, !dbg !443, !tbaa !444
   tail call void @llvm.dbg.value(metadata i32 1, i64 0, metadata !119, metadata !{!"0x102"}), !dbg !448
   %sub10454270 = add nsw i32 %0, -1, !dbg !448
   %cmp10464271 = icmp sgt i32 %sub10454270, 1, !dbg !448