tests/inlineasm: Add test for PUSH LR and POP PC.

tests/inlineasm/asmpushpop.py

@@ -6,4 +6,16 @@ def f(r0, r1, r2):
     pop({r1, r2})
 
 
+@micropython.asm_thumb
+def g():
+    b(START)
+    label(SUBROUTINE)
+    push({lr})  # push return address
+    mov(r0, 7)
+    pop({pc})  # return
+    label(START)
+    bl(SUBROUTINE)
+
+
 print(f(0, 1, 2))
+print(g())

tests/inlineasm/asmpushpop.py.exp

@@ -1 +1,2 @@
 1
+7