Add early-stage optimization crate (#556)

* Add simple constant folding and folding tests

cranelift/filetests/preopt/branch.clif

@@ -0,0 +1,54 @@
+test preopt
+target x86_64
+
+function %brz_fold() -> i32 {
+ebb0:
+    v0 = bconst.b1 false
+    brz v0, ebb2
+    jump ebb1
+ebb1:
+    v1 = iconst.i32 42
+    return v1
+ebb2:
+    v2 = iconst.i32 24
+    return v2
+}
+; sameln: function %brz_fold
+; nextln: ebb0:
+; nextln:     v0 = bconst.b1 false
+; nextln:     jump ebb2
+; nextln: 
+; nextln: ebb1:
+; nextln:     v1 = iconst.i32 42
+; nextln:     return v1
+; nextln: 
+; nextln: ebb2:
+; nextln:     v2 = iconst.i32 24
+; nextln:     return v2
+; nextln: }
+
+function %brnz_fold() -> i32 {
+ebb0:
+    v0 = bconst.b1 true
+    brnz v0, ebb2
+    jump ebb1
+ebb1:
+    v1 = iconst.i32 42
+    return v1
+ebb2:
+    v2 = iconst.i32 24
+    return v2
+}
+; sameln: function %brnz_fold
+; nextln: ebb0:
+; nextln:     v0 = bconst.b1 true
+; nextln:     jump ebb2
+; nextln: 
+; nextln: ebb1:
+; nextln:     v1 = iconst.i32 42
+; nextln:     return v1
+; nextln: 
+; nextln: ebb2:
+; nextln:     v2 = iconst.i32 24
+; nextln:     return v2
+; nextln: }

cranelift/filetests/preopt/numerical.clif

@@ -0,0 +1,36 @@
+test preopt
+target x86_64
+
+function %iadd_fold() -> i32 {
+ebb0:
+    v0 = iconst.i32 37
+    v1 = iconst.i32 5
+    v2 = iadd v0, v1
+    v3 = iconst.i32 8
+    v4 = iadd v2, v3
+    return v4
+}
+; sameln: function %iadd_fold
+; nextln: ebb0:
+; nextln:     v0 = iconst.i32 37
+; nextln:     v1 = iconst.i32 5
+; nextln:     v2 = iconst.i32 42
+; nextln:     v3 = iconst.i32 8
+; nextln:     v4 = iconst.i32 50
+; nextln:     return v4
+; nextln: }
+
+function %isub_fold() -> i32 {
+ebb0:
+    v0 = iconst.i32 42
+    v1 = iconst.i32 1
+    v2 = isub v0, v1
+    return v2
+}
+; sameln: function %isub_fold
+; nextln: ebb0:
+; nextln:     v0 = iconst.i32 42
+; nextln:     v1 = iconst.i32 1
+; nextln:     v2 = iconst.i32 41
+; nextln:     return v2
+; nextln: }

cranelift/filetests/simple_preopt/div_by_const_indirect.clif

@@ -1,4 +1,4 @@
-test preopt
+test simple_preopt
 target i686 baseline
 
 ; Cases where the denominator is created by an iconst

cranelift/filetests/simple_preopt/div_by_const_non_power_of_2.clif

@@ -1,4 +1,4 @@
-test preopt
+test simple_preopt
 target i686 baseline
 
 ; -------- U32 --------

cranelift/filetests/simple_preopt/div_by_const_power_of_2.clif

@@ -1,4 +1,4 @@
-test preopt
+test simple_preopt
 target i686 baseline
 
 ; -------- U32 --------

cranelift/filetests/simple_preopt/rem_by_const_non_power_of_2.clif

@@ -1,4 +1,4 @@
-test preopt
+test simple_preopt
 target i686 baseline
 
 ; -------- U32 --------

cranelift/filetests/simple_preopt/rem_by_const_power_of_2.clif

@@ -1,4 +1,4 @@
-test preopt
+test simple_preopt
 target i686 baseline
 
 ; -------- U32 --------

cranelift/filetests/simple_preopt/simplify.clif

@@ -1,4 +1,4 @@
-test preopt
+test simple_preopt
 target i686
 
 function %iadd_imm(i32) -> i32 {