compiler: fix make([]T, ...) with big integers on 32-bit systems or less

Previously, this would have resulted in a LLVM verification error
because runtime.sliceBoundsCheckMake would not accept 64-bit integers on
these platforms.

src/runtime/panic.go

@@ -62,3 +62,10 @@ func sliceBoundsCheckMake(length, capacity uint) {
 		runtimePanic("slice size out of range")
 	}
 }
+
+// Check for bounds in *ssa.MakeSlice. Supports 64-bit indexes.
+func sliceBoundsCheckMake64(length, capacity uint64) {
+	if !(0 <= length && length <= capacity) {
+		runtimePanic("slice size out of range")
+	}
+}