tests: Add a test for argument passing to inline-asm functions.

tests/inlineasm/asmargs.py

+# test passing arguments
+
+@micropython.asm_thumb
+def arg0():
+    mov(r0, 1)
+print(arg0())
+
+@micropython.asm_thumb
+def arg1(r0):
+    add(r0, r0, 1)
+print(arg1(1))
+
+@micropython.asm_thumb
+def arg2(r0, r1):
+    add(r0, r0, r1)
+print(arg2(1, 2))
+
+@micropython.asm_thumb
+def arg3(r0, r1, r2):
+    add(r0, r0, r1)
+    add(r0, r0, r2)
+print(arg3(1, 2, 3))
+
+@micropython.asm_thumb
+def arg4(r0, r1, r2, r3):
+    add(r0, r0, r1)
+    add(r0, r0, r2)
+    add(r0, r0, r3)
+print(arg4(1, 2, 3, 4))

tests/inlineasm/asmargs.py.exp

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+10