[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/Transforms/GlobalOpt/atomic.ll b/llvm/test/Transforms/GlobalOpt/atomic.ll
index ac05bfd..563c1fe 100644
--- a/llvm/test/Transforms/GlobalOpt/atomic.ll
+++ b/llvm/test/Transforms/GlobalOpt/atomic.ll
@@ -8,7 +8,7 @@
 
 define void @test1() {
 entry:
-  %0 = load atomic i8* bitcast (i64* @GV1 to i8*) acquire, align 8
+  %0 = load atomic i8, i8* bitcast (i64* @GV1 to i8*) acquire, align 8
   ret void
 }
 
@@ -20,6 +20,6 @@
 }
 define i32 @test2b() {
 entry:
-  %atomic-load = load atomic i32* @GV2 seq_cst, align 4
+  %atomic-load = load atomic i32, i32* @GV2 seq_cst, align 4
   ret i32 %atomic-load
 }