Use "mr" and make a few other tweaks in PowerPC ncg table.

Use extended "mr" instead of basic "or" to move registers.  Both "mr"
and "or" encode the same machine instruction.  With "mr", I can more
easily search the assembly output for register moves.

Fold several stacking rules into a single rule ANY_BHW-REG to STACK.

Remove the EM patterns for loc mlu $2==2 and loc slu.  The first
pattern had the wrong size (should be $2==4, not $2==2).  Both
patterns were redundant.  They rewrote loc mlu as loc mli and loc slu
as loc sli, but this table doesn't have patterns for loc mli or loc
sli, so it is enough to rewrite mlu as mli and slu as sli.

mach/powerpc/ncg/table

@@ -353,11 +353,12 @@ INSTRUCTIONS
   mfspr           GPR:wo, SPR:ro cost(4, 3).
   mtspr           SPR:wo, GPR:ro cost(4, 2).
   or              GPR:wo, GPR:ro, GPR:ro.
+    mr            GPR:wo, GPR:ro.
+  orX "or."       GPR:wo:cc, GPR:ro, GPR:ro.
+    orX_readonly "or." GPR:ro:cc, GPR:ro, GPR:ro.
   orc             GPR:wo, GPR:ro, GPR:ro.
   ori             GPR:wo, GPR:ro, CONST+LABEL_LO:ro.
   oris            GPR:wo, GPR:ro, CONST:ro.
-  orX "or."       GPR:wo:cc, GPR:ro, GPR:ro.
-    orX_readonly "or." GPR:ro:cc, GPR:ro, GPR:ro.
   rlwinm          GPR:wo, GPR:ro, CONST:ro, CONST:ro, CONST:ro.
     extlwi        GPR:wo, GPR:ro, CONST:ro, CONST:ro.
     extrwi        GPR:wo, GPR:ro, CONST:ro, CONST:ro.
@@ -389,7 +390,7 @@ INSTRUCTIONS
 MOVES
 
 	from GPR to GPR
-		gen or %2, %1, %1
+		gen mr %2, %1
 
 /* Constants */
 
@@ -626,6 +627,9 @@ TESTS
 
 	/* Given orX %1, %1, %1, ncgg says, "Instruction destroys %1,
 	 * not allowed here".  We use orX_readonly to trick ncgg.
+	 *
+	 * Using "or." and not "mr." because mach/powerpc/top/table
+	 * was optimizing "or." and not "mr.".
 	 */
 	to test GPR
 		gen
@@ -650,33 +654,9 @@ STACKINGRULES
 			stwu %1.2, {IND_RC_W, SP, 0-4}
 			stwu %1.1, {IND_RC_W, SP, 0-4}
 
-	from CONST_STACK to STACK
+	from ANY_BHW-REG to STACK
 		gen
-			COMMENT("stack CONST_STACK")
+			COMMENT("stack ANY_BHW-REG")
-			move %1, RSCRATCH
-			stwu RSCRATCH, {IND_RC_W, SP, 0-4}
-
-	from SEX_B to STACK
-		gen
-			COMMENT("stack SEX_B")
-			extsb RSCRATCH, %1.reg
-			stwu RSCRATCH, {IND_RC_W, SP, 0-4}
-
-	from SEX_H to STACK
-		gen
-			COMMENT("stack SEX_H")
-			extsh RSCRATCH, %1.reg
-			stwu RSCRATCH, {IND_RC_W, SP, 0-4}
-
-	from SUM_ALL + LOGICAL_ALL to STACK
-		gen
-			COMMENT("stack SUM_ALL + LOGICAL_ALL")
-			move %1, RSCRATCH
-			stwu RSCRATCH, {IND_RC_W, SP, 0-4}
-
-	from IND_ALL_BHW to STACK
-		gen
-			COMMENT("stack IND_ALL_BHW")
 			move %1, RSCRATCH
 			stwu RSCRATCH, {IND_RC_W, SP, 0-4}
 
@@ -1198,21 +1178,11 @@ PATTERNS
 			loc 1
 			sbi 4
 
-	pat loc mlu $2==2                  /* Unsigned multiply by constant */
+	pat mlu                            /* Multiply unsigned */
-		leaving
-			loc $1
-			mli 4
-
-	pat mlu                            /* Unsigned multiply by var */
 		leaving
 			mli $1
 
-	pat loc slu                        /* Shift left unsigned by constant amount */
+	pat slu                            /* Shift left unsigned */
-		leaving
-			loc $1
-			sli $2
-
-	pat slu                            /* Shift left unsigned by variable amount */
 		leaving
 			sli $1