tests/tcg/arm: fix up test-arm-iwmmxt test

We need to rename the source file to a .S so we can do a single-line
assemble and link invocation. We also specify the additional CFLAGS
for the compile as it's a non-standard ARM binary.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
[rth: force fpu configuration]
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

tests/tcg/arm/Makefile.target

@@ -8,9 +8,14 @@ ARM_SRC=$(SRC_PATH)/tests/tcg/arm
 # Set search path for all sources
 VPATH 		+= $(ARM_SRC)
 
+TESTS += hello-arm test-arm-iwmmxt
 
 hello-arm: CFLAGS+=-marm -ffreestanding
 hello-arm: LDFLAGS+=-nostdlib
 
+test-arm-iwmmxt: CFLAGS+=-marm -march=iwmmxt -mabi=aapcs -mfpu=fpv4-sp-d16
+test-arm-iwmmxt: test-arm-iwmmxt.S
+	$(CC) $(CFLAGS) $< -o $@ $(LDFLAGS)
+
 # On ARM Linux only supports 4k pages
 EXTRA_RUNS+=run-test-mmap-4096