[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/Feature/testalloca.ll b/llvm/test/Feature/testalloca.ll
index ba2eed8..0405320 100644
--- a/llvm/test/Feature/testalloca.ll
+++ b/llvm/test/Feature/testalloca.ll
@@ -9,7 +9,7 @@
         alloca i8, i32 5                ; <i8*>:1 [#uses=0]
         %ptr = alloca i32               ; <i32*> [#uses=2]
         store i32 3, i32* %ptr
-        %val = load i32* %ptr           ; <i32> [#uses=0]
+        %val = load i32, i32* %ptr           ; <i32> [#uses=0]
         %sptr = alloca %struct          ; <%struct*> [#uses=2]
         %nsptr = getelementptr %struct, %struct* %sptr, i64 0, i32 1             ; <%inners*> [#uses=1]
         %ubsptr = getelementptr %inners, %inners* %nsptr, i64 0, i32 1           ; <{ i8 }*> [#uses=1]