[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/Generic/badFoldGEP.ll b/llvm/test/CodeGen/Generic/badFoldGEP.ll
index 318cc91..8150390 100644
--- a/llvm/test/CodeGen/Generic/badFoldGEP.ll
+++ b/llvm/test/CodeGen/Generic/badFoldGEP.ll
@@ -21,7 +21,7 @@
         %cann-indvar-idxcast = sext i32 %argc to i64            ; <i64> [#uses=1]
         %reg841 = getelementptr [497 x %Domain], [497 x %Domain]* @domain_array, i64 0, i64 %cann-indvar-idxcast, i32 3          ; <i32*> [#uses=1]
         %reg846 = getelementptr i32, i32* %reg841, i64 1             ; <i32*> [#uses=1]
-        %reg820 = load i32* %reg846             ; <i32> [#uses=1]
+        %reg820 = load i32, i32* %reg846             ; <i32> [#uses=1]
         ret i32 %reg820
 }