Rename "Stackmap" to "StackMap"

And "stackmap" to "stack_map".

This commit is purely mechanical.

cranelift/filetests/filetests/stack_maps/call.clif

@@ -0,0 +1,103 @@
+test stack_maps
+set enable_safepoints=true
+target x86_64
+
+function %icall_fast(r64) -> r64 fast {
+; check:  function %icall_fast
+; nextln:     ss0 = spill_slot 8, offset -32
+    fn0 = %none()
+block0(v0: r64):
+; check: ss0]         v0 = spill v2
+; check:              safepoint v0
+    call fn0()
+    return v0
+}
+; check:  Stack maps:
+; nextln: 
+; nextln: safepoint v0
+; nextln:   - mapped words: 4
+; nextln:   - live: [0]
+
+function %icall_sys_v(r64) -> r64 system_v {
+; check:  function %icall_sys_v
+; nextln:     ss0 = spill_slot 8, offset -32
+    fn0 = %none()
+block0(v0: r64):
+; check: ss0]         v0 = spill v2
+; check:              safepoint v0
+    call fn0()
+    return v0
+}
+; check:  Stack maps:
+; nextln: 
+; nextln: safepoint v0
+; nextln:   - mapped words: 4
+; nextln:   - live: [0]
+
+function %icall_fastcall(r64) -> r64 windows_fastcall {
+; check:  function %icall_fastcall
+; nextln:     ss0 = spill_slot 8, offset -32
+; nextln:     ss1 = incoming_arg 24, offset -24
+; nextln:     ss2 = explicit_slot 32, offset -64
+    fn0 = %none()
+block0(v0: r64):
+; check: ss0]         v0 = spill v2
+; check:              safepoint v0
+    call fn0()
+    return v0
+}
+; check:  Stack maps:
+; nextln: 
+; nextln: safepoint v0
+; nextln:   - mapped words: 8
+; nextln:   - live: [4]
+
+function %call_fast(r64) -> r64 fast {
+; check:  function %call_fast
+; nextln:     ss0 = spill_slot 8, offset -32
+    fn0 = colocated %none()
+block0(v0: r64):
+; check: ss0]         v0 = spill v1
+; check:              safepoint v0
+    call fn0()
+    return v0
+}
+; check:  Stack maps:
+; nextln: 
+; nextln: safepoint v0
+; nextln:   - mapped words: 4
+; nextln:   - live: [0]
+
+function %call_sys_v(r64) -> r64 system_v {
+; check:  function %call_sys_v
+; nextln:     ss0 = spill_slot 8, offset -32
+    fn0 = colocated %none()
+block0(v0: r64):
+; check: ss0]         v0 = spill v1
+; check:              safepoint v0
+    call fn0()
+    return v0
+}
+; check:  Stack maps:
+; nextln: 
+; nextln: safepoint v0
+; nextln:   - mapped words: 4
+; nextln:   - live: [0]
+
+function %call_fastcall(r64) -> r64 windows_fastcall {
+; check:  function %call_fastcall
+; nextln:     ss0 = spill_slot 8, offset -32
+; nextln:     ss1 = incoming_arg 24, offset -24
+; nextln:     ss2 = explicit_slot 32, offset -64
+    fn0 = colocated %none()
+block0(v0: r64):
+; check: ss0]         v0 = spill v1
+; check:              safepoint v0
+    call fn0()
+    return v0
+}
+; check:  Stack maps:
+; nextln: 
+; nextln: safepoint v0
+; nextln:   - mapped words: 8
+; nextln:   - live: [4]

cranelift/filetests/filetests/stack_maps/incoming_args.clif

@@ -0,0 +1,30 @@
+test stack_maps
+set enable_safepoints=true
+target x86_64
+
+;; Incoming args get included in stack maps.
+
+function %incoming_args(r64, r64, r64, r64, r64) -> r64 windows_fastcall {
+; check:  r64 [32]
+; nextln: ss0 = incoming_arg 8, offset 32
+; nextln: ss1 = incoming_arg 24, offset -24
+; nextln: ss2 = explicit_slot 32, offset -64
+
+    fn0 = %none()
+; nextln: sig0 = () fast
+; nextln: fn0 = %none sig0
+
+block0(v0: r64, v1: r64, v2: r64, v3: r64, v4: r64):
+; check: v4: r64 [ss0]
+
+    call fn0()
+; check:  safepoint v4
+; nextln: call_indirect
+    return v4
+}
+
+; check:  Stack maps:
+; nextln: 
+; nextln: safepoint v4
+; nextln:   - mapped words: 13
+; nextln:   - live: [12]