Revert "[mips] Fix multiprecision arithmetic."

This reverts commit r305389. This broke chromium builds, so reverting
while I investigate further.

llvm-svn: 306741
diff --git a/llvm/test/CodeGen/Mips/llcarry.ll b/llvm/test/CodeGen/Mips/llcarry.ll
index b7cc6fc..fcf1294 100644
--- a/llvm/test/CodeGen/Mips/llcarry.ll
+++ b/llvm/test/CodeGen/Mips/llcarry.ll
@@ -14,9 +14,9 @@
   %add = add nsw i64 %1, %0
   store i64 %add, i64* @k, align 8
 ; 16:	addu	${{[0-9]+}}, ${{[0-9]+}}, ${{[0-9]+}}
-; 16:	addu	${{[0-9]+}}, ${{[0-9]+}}, ${{[0-9]+}}
 ; 16:	sltu	${{[0-9]+}}, ${{[0-9]+}}
-; 16:	move	${{[0-9]+}}, $24
+; 16:	move	${{[0-9]+}}, $t8
+; 16:	addu	${{[0-9]+}}, ${{[0-9]+}}, ${{[0-9]+}}
 ; 16:	addu	${{[0-9]+}}, ${{[0-9]+}}, ${{[0-9]+}}
   ret void
 }
@@ -28,8 +28,8 @@
   %sub = sub nsw i64 %0, %1
 ; 16:	subu	${{[0-9]+}}, ${{[0-9]+}}, ${{[0-9]+}}
 ; 16:	sltu	${{[0-9]+}}, ${{[0-9]+}}
-; 16:	move	${{[0-9]+}}, $24
-; 16:	subu	${{[0-9]+}}, ${{[0-9]+}}, ${{[0-9]+}}
+; 16:	move	${{[0-9]+}}, $t8
+; 16:	addu	${{[0-9]+}}, ${{[0-9]+}}, ${{[0-9]+}}
 ; 16:	subu	${{[0-9]+}}, ${{[0-9]+}}, ${{[0-9]+}}
   store i64 %sub, i64* @l, align 8
   ret void
@@ -41,7 +41,8 @@
   %add = add nsw i64 %0, 15
 ; 16:	addiu	${{[0-9]+}}, 15
 ; 16:	sltu	${{[0-9]+}}, ${{[0-9]+}}
-; 16:	move	${{[0-9]+}}, $24
+; 16:	move	${{[0-9]+}}, $t8
+; 16:	addu	${{[0-9]+}}, ${{[0-9]+}}, ${{[0-9]+}}
 ; 16:	addu	${{[0-9]+}}, ${{[0-9]+}}, ${{[0-9]+}}
   store i64 %add, i64* @m, align 8
   ret void