PPC NCG: Fix sign hints in C calls

Sign hints for parameters are in the second component of the pair.

Fixes #23034

compiler/GHC/CmmToAsm/PPC/CodeGen.hs

@@ -1770,7 +1770,7 @@ genCCall' config gcp target dest_regs args
                                 _ -> panic "genCall': unknown calling conv."
 
         argReps = map (cmmExprType platform) args
-        (argHints, _) = foreignTargetHints target
+        (_, argHints) = foreignTargetHints target
 
         roundTo a x | x `mod` a == 0 = x
                     | otherwise = x + a - (x `mod` a)

testsuite/tests/codeGen/should_run/T23034.h

+void t_printf(signed long a, signed int b, signed short c, signed char d);

testsuite/tests/codeGen/should_run/T23034.hs

+module Main where
+
+import Foreign.C
+
+foreign import ccall unsafe "T23034.h t_printf"
+  t_printf :: CLong -> CInt -> CShort -> CSChar -> IO ()
+
+main = t_printf (-1) (-2) (-3) (-4)

testsuite/tests/codeGen/should_run/T23034.stdout

+-1 -2 -3 -4

testsuite/tests/codeGen/should_run/T23034_c.c

+#include "T23034.h"
+#include <stdio.h>
+
+void t_printf(signed long a, signed int b, signed short c, signed char d) {
+  printf("%ld %ld %ld %ld\n", a, 0L + b, 0L + c, 0L + d);
+}

testsuite/tests/codeGen/should_run/all.T

@@ -247,3 +247,6 @@ test('T24295b', normal, compile_and_run, ['-O -floopification -fpedantic-bottoms
 test('T24664a', normal, compile_and_run, ['-O'])
 test('T24664b', normal, compile_and_run, ['-O'])
 test('CtzClz0', normal, compile_and_run, [''])
+test('T23034', [req_c
+               , when(arch('x86_64') and opsys('darwin'), expect_broken(25018))
+               ], compile_and_run, ['-O2 T23034_c.c'])