[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/Analysis/ScalarEvolution/avoid-infinite-recursion-0.ll b/llvm/test/Analysis/ScalarEvolution/avoid-infinite-recursion-0.ll
index 7eeb308..0976ef9 100644
--- a/llvm/test/Analysis/ScalarEvolution/avoid-infinite-recursion-0.ll
+++ b/llvm/test/Analysis/ScalarEvolution/avoid-infinite-recursion-0.ll
@@ -7,7 +7,7 @@
 
 define i32 @test() {
 entry:
-	%0 = load i32** undef, align 8		; <i32*> [#uses=1]
+	%0 = load i32*, i32** undef, align 8		; <i32*> [#uses=1]
 	%1 = ptrtoint i32* %0 to i64		; <i64> [#uses=1]
 	%2 = sub i64 undef, %1		; <i64> [#uses=1]
 	%3 = lshr i64 %2, 3		; <i64> [#uses=1]