[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/ARM/cse-ldrlit.ll b/llvm/test/CodeGen/ARM/cse-ldrlit.ll
index 3f5d4c2..e76e47e 100644
--- a/llvm/test/CodeGen/ARM/cse-ldrlit.ll
+++ b/llvm/test/CodeGen/ARM/cse-ldrlit.ll
@@ -9,7 +9,7 @@
 declare void @bar(i32*)
 
 define void @foo() {
-  %flag = load i32* getelementptr inbounds([16 x i32]* @var, i32 0, i32 1)
+  %flag = load i32, i32* getelementptr inbounds([16 x i32]* @var, i32 0, i32 1)
   %tst = icmp eq i32 %flag, 0
   br i1 %tst, label %true, label %false
 true: