Inline jump tables in parsed br_table instructions (#5755)

As jump tables are used by at most one br_table instruction, inline their definition in those instructions instead of requiring them to be declared as function-level metadata.

cranelift/filetests/filetests/isa/aarch64/bti.clif

@@ -3,10 +3,8 @@ set unwind_info=false
 target aarch64 use_bti
 
 function %f1(i32) -> i32 {
-    jt0 = jump_table [block1, block2, block3]
-
 block0(v0: i32):
-    br_table v0, block4, jt0
+    br_table v0, block4, [block1, block2, block3]
 
 block1:
     v1 = iconst.i32 1
@@ -62,12 +60,10 @@ block5(v5: i32):
 ;   ret
 
 function %f2(i64) -> i64 {
-    jt0 = jump_table [block2]
-
 block0(v0: i64):
     v1 = ireduce.i32 v0
     v2 = load.i64 notrap aligned table v0
-    br_table v1, block1, jt0
+    br_table v1, block1, [block2]
 
 block1:
     return v2

cranelift/filetests/filetests/isa/aarch64/jumptable.clif

@@ -3,10 +3,8 @@ set unwind_info=false
 target aarch64
 
 function %f(i32) -> i32 {
-  jt0 = jump_table [block1, block2, block3]
-
 block0(v0: i32):
-  br_table v0, block4, jt0
+  br_table v0, block4, [block1, block2, block3]
 
 block1:
   v1 = iconst.i32 1

cranelift/filetests/filetests/isa/s390x/jumptable.clif

@@ -2,10 +2,8 @@ test compile precise-output
 target s390x
 
 function %f(i32) -> i32 {
-  jt0 = jump_table [block1, block2, block3]
-
 block0(v0: i32):
-  br_table v0, block4, jt0
+  br_table v0, block4, [block1, block2, block3]
 
 block1:
   v1 = iconst.i32 1

cranelift/filetests/filetests/isa/x64/atomic-cas-bug.clif

@@ -34,7 +34,6 @@ function u0:31(i64, i32, i32, i8, i8) -> i32, i32 system_v {
     fn3 = colocated u0:11 sig3
     fn4 = u0:110 sig4
     fn5 = u0:110 sig5
-    jt0 = jump_table [block2, block4, block5, block6, block7]
 
                                 block0(v0: i64, v1: i32, v2: i32, v3: i8, v4: i8):
                                     v34 -> v0
@@ -82,7 +81,7 @@ function u0:31(i64, i32, i32, i8, i8) -> i32, i32 system_v {
 @0005                               jump block37
 
                                 block37:
-@0005                               br_table v10, block36, jt0
+@0005                               br_table v10, block36, [block2, block4, block5, block6, block7]
 
                                 block2:
 @0001                               v11 = stack_load.i8 ss3+1

cranelift/filetests/filetests/isa/x64/branches.clif

@@ -181,10 +181,8 @@ block2:
 ;   ret
 
 function %f5(i32) -> i8 {
-  jt0 = jump_table [block1, block2]
-
 block0(v0: i32):
-  br_table v0, block1, jt0
+  br_table v0, block1, [block1, block2]
 
 block1:
   v1 = iconst.i8 1

cranelift/filetests/filetests/isa/x64/unused_jt_unreachable_block.clif

@@ -1,22 +0,0 @@
-test compile precise-output
-target x86_64
-
-;; From: https://github.com/bytecodealliance/wasmtime/issues/2670
-
-function %f() system_v {
-    jt0 = jump_table [block1]
-
-block0:
-    return
-
-block1:
-    trap unreachable
-}
-
-;   pushq   %rbp
-;   movq    %rsp, %rbp
-; block0:
-;   movq    %rbp, %rsp
-;   popq    %rbp
-;   ret
-