[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/arm64-extend.ll b/llvm/test/CodeGen/AArch64/arm64-extend.ll
index ce3f001..0ef68f8 100644
--- a/llvm/test/CodeGen/AArch64/arm64-extend.ll
+++ b/llvm/test/CodeGen/AArch64/arm64-extend.ll
@@ -9,7 +9,7 @@
 ; CHECK:  ret
   %idxprom = sext i32 %i to i64
   %arrayidx = getelementptr inbounds [0 x i32], [0 x i32]* @array, i64 0, i64 %idxprom
-  %tmp1 = load i32* %arrayidx, align 4
+  %tmp1 = load i32, i32* %arrayidx, align 4
   %conv = sext i32 %tmp1 to i64
   ret i64 %conv
 }