Restore micromips-gp-rc.ll and update checks

Author: vladimirradosavljevic

llvm/test/CodeGen/Mips/micromips-gp-rc.ll

@@ -0,0 +1,19 @@
+; RUN: llc -march=mipsel -mcpu=mips32r2 -mattr=+micromips \
+; RUN:   -relocation-model=pic -O3 < %s | FileCheck %s
+
+@g = external global i32
+
+; Function Attrs: noreturn nounwind
+define void @foo() #0 {
+entry:
+  %0 = load i32, ptr @g, align 4
+  tail call void @exit(i32 signext %0)
+  unreachable
+}
+
+; Function Attrs: noreturn
+declare void @exit(i32 signext)
+
+; CHECK: addu $gp, ${{[0-9]+}}, ${{[0-9]+}}
+; CHECK: lw ${{[0-9]+}}, %got(g)($gp)
+; CHECK: lw ${{[0-9]+}}, %call16(exit)($gp)