[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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230794 91177308-0d34-0410-b5e6-96231b3b80d8

test/Transforms/SCCP/ipsccp-basic.ll

@@ -50,7 +50,7 @@ define i32 @test2b() {
 @G = internal global i32 undef
 
 define void @test3a() {
-	%X = load i32* @G
+	%X = load i32, i32* @G
 	store i32 %X, i32* @G
 	ret void
 }
@@ -59,7 +59,7 @@ define void @test3a() {
 
 
 define i32 @test3b() {
-	%V = load i32* @G
+	%V = load i32, i32* @G
 	%C = icmp eq i32 %V, 17
 	br i1 %C, label %T, label %F
 T:
@@ -203,7 +203,7 @@ define void @test8b(i32* %P) {
 define void @test9() {
 entry:
         %local_foo = alloca {  }
-        load {  }* @test9g
+        load {  }, {  }* @test9g
         store {  } %0, {  }* %local_foo
         ret void
 }