[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/2009-11-02-NegativeLane.ll b/llvm/test/CodeGen/ARM/2009-11-02-NegativeLane.ll
index 2597b41..154cd65 100644
--- a/llvm/test/CodeGen/ARM/2009-11-02-NegativeLane.ll
+++ b/llvm/test/CodeGen/ARM/2009-11-02-NegativeLane.ll
@@ -8,7 +8,7 @@
 
 bb:                                               ; preds = %bb, %entry
 ; CHECK: vld1.16 {d16[], d17[]}
-  %0 = load i16* undef, align 2
+  %0 = load i16, i16* undef, align 2
   %1 = insertelement <8 x i16> undef, i16 %0, i32 2
   %2 = insertelement <8 x i16> %1, i16 undef, i32 3
   %3 = mul <8 x i16> %2, %2