x64: Lower tlsvalue, sqmul_round_sat, and uunarrow in ISLE (#4793)

Lower tlsvalue, sqmul_round_sat, and uunarrow in ISLE.

cranelift/filetests/filetests/isa/x64/sqmul_round_sat.clif

@@ -0,0 +1,19 @@
+test compile precise-output
+target x86_64
+
+function %f1(i16x8, i16x8) -> i16x8 {
+block0(v0: i16x8, v1: i16x8):
+  v2 = sqmul_round_sat v0, v1
+  return v2
+}
+
+;   pushq   %rbp
+;   movq    %rsp, %rbp
+; block0:
+;   load_const VCodeConstant(0), %xmm7
+;   pmulhrsw %xmm0, %xmm1, %xmm0
+;   pcmpeqw %xmm7, %xmm0, %xmm7
+;   pxor    %xmm0, %xmm7, %xmm0
+;   movq    %rbp, %rsp
+;   popq    %rbp
+;   ret

cranelift/filetests/filetests/isa/x64/uunarrow.clif

@@ -0,0 +1,26 @@
+test compile precise-output
+target x86_64
+
+function %f1(f64x2) -> i32x4 {
+block0(v0: f64x2):
+  v1 = fcvt_to_uint_sat.i64x2 v0
+  v2 = vconst.i64x2 [0 0]
+  v3 = uunarrow v1, v2
+  return v3
+}
+
+;   pushq   %rbp
+;   movq    %rsp, %rbp
+; block0:
+;   xorpd   %xmm3, %xmm3, %xmm3
+;   maxpd   %xmm0, %xmm3, %xmm0
+;   load_const VCodeConstant(0), %xmm7
+;   minpd   %xmm0, %xmm7, %xmm0
+;   roundpd $3, %xmm0, %xmm0
+;   load_const VCodeConstant(1), %xmm13
+;   addpd   %xmm0, %xmm13, %xmm0
+;   shufps  $136, %xmm0, %xmm3, %xmm0
+;   movq    %rbp, %rsp
+;   popq    %rbp
+;   ret
+