[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/R600/no-initializer-constant-addrspace.ll b/llvm/test/CodeGen/R600/no-initializer-constant-addrspace.ll
index 532edf0..ef0cb0c 100644
--- a/llvm/test/CodeGen/R600/no-initializer-constant-addrspace.ll
+++ b/llvm/test/CodeGen/R600/no-initializer-constant-addrspace.ll
@@ -6,7 +6,7 @@
 
 ; FUNC-LABEL: {{^}}load_extern_const_init:
 define void @load_extern_const_init(i32 addrspace(1)* %out) nounwind {
-  %val = load i32 addrspace(2)* getelementptr ([5 x i32] addrspace(2)* @extern_const_addrspace, i64 0, i64 3), align 4
+  %val = load i32, i32 addrspace(2)* getelementptr ([5 x i32] addrspace(2)* @extern_const_addrspace, i64 0, i64 3), align 4
   store i32 %val, i32 addrspace(1)* %out, align 4
   ret void
 }
@@ -15,7 +15,7 @@
 
 ; FUNC-LABEL: {{^}}load_undef_const_init:
 define void @load_undef_const_init(i32 addrspace(1)* %out) nounwind {
-  %val = load i32 addrspace(2)* getelementptr ([5 x i32] addrspace(2)* @undef_const_addrspace, i64 0, i64 3), align 4
+  %val = load i32, i32 addrspace(2)* getelementptr ([5 x i32] addrspace(2)* @undef_const_addrspace, i64 0, i64 3), align 4
   store i32 %val, i32 addrspace(1)* %out, align 4
   ret void
 }