[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/AArch64/paired-load.ll b/llvm/test/CodeGen/AArch64/paired-load.ll
index 72b5afc..e6d2d4f 100644
--- a/llvm/test/CodeGen/AArch64/paired-load.ll
+++ b/llvm/test/CodeGen/AArch64/paired-load.ll
@@ -8,8 +8,8 @@
 define void @f(i64* %p, i64* %q) {
   %addr2 = getelementptr i64, i64* %q, i32 1
   %addr = getelementptr i64, i64* %p, i32 1
-  %x = load i64* %p
-  %y = load i64* %addr
+  %x = load i64, i64* %p
+  %y = load i64, i64* %addr
   store i64 %x, i64* %q
   store i64 %y, i64* %addr2
   ret void