Rename intel to x86.

x86 is the more accurate name, as there are non-Intel x86 implementations.

Fixes #263.

cranelift/filetests/isa/x86/allones_funcaddrs32.cton

@@ -0,0 +1,25 @@
+; binary emission of 32-bit code.
+test binemit
+set is_compressed
+set allones_funcaddrs
+isa x86 haswell
+
+; The binary encodings can be verified with the command:
+;
+;   sed -ne 's/^ *; asm: *//p' filetests/isa/x86/allones_funcaddrs32.cton | llvm-mc -show-encoding -triple=i386
+;
+
+; Tests from binary32.cton affected by allones_funcaddrs.
+function %I32() {
+    sig0 = ()
+    fn0 = function %foo()
+
+ebb0:
+
+    ; asm: movl $-1, %ecx
+    [-,%rcx]            v400 = func_addr.i32 fn0        ; bin: b9 Abs4(%foo) ffffffff
+    ; asm: movl $-1, %esi
+    [-,%rsi]            v401 = func_addr.i32 fn0        ; bin: be Abs4(%foo) ffffffff
+
+    return                                              ; bin: c3
+}