[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/Transforms/LoopStrengthReduce/pr12691.ll b/llvm/test/Transforms/LoopStrengthReduce/pr12691.ll
index 8399434..dfc1343 100644
--- a/llvm/test/Transforms/LoopStrengthReduce/pr12691.ll
+++ b/llvm/test/Transforms/LoopStrengthReduce/pr12691.ll
@@ -13,13 +13,13 @@
   br i1 %tobool, label %for.cond, label %for.end
 
 for.end:
-; CHECK:  %tmp1 = load i32* @d, align 4
-; CHECK-NEXT:  %tmp2 = load i32* @d, align 4
+; CHECK:  %tmp1 = load i32, i32* @d, align 4
+; CHECK-NEXT:  %tmp2 = load i32, i32* @d, align 4
 ; CHECK-NEXT:  %0 = sub i32 %tmp1, %tmp2
 
-  %tmp1 = load i32* @d, align 4
+  %tmp1 = load i32, i32* @d, align 4
   %add = add nsw i32 %tmp1, %g.0
-  %tmp2 = load i32* @d, align 4
+  %tmp2 = load i32, i32* @d, align 4
   %tobool26 = icmp eq i32 %x, 0
   br i1 %tobool26, label %for.end5, label %for.body.lr.ph