[PATCH] Add tabulars for options with enum values.

[Martin Liška]

Hello.

We have various enum options that do not properly display options with --help=*:
Apart from that, some of them are not separated by tabular, but with a space.

Using the suggested patch, --help=common will get:

--- /tmp/before	2017-02-28 10:41:12.107024945 +0100
+++ /tmp/after	2017-02-28 10:41:32.615415978 +0100
@@ -193,7 +193,7 @@
   -ffloat-store               		[disabled]
   -fforce-addr                		
   -fforward-propagate         		[disabled]
-  -ffp-contract=              		fast
+  -ffp-contract=[off|on|fast] 		fast
   -ffp-int-builtin-inexact    		[enabled]
   -ffunction-cse              		[enabled]
   -ffunction-sections         		[disabled]
@@ -242,10 +242,10 @@
   -fipa-sra                   		[disabled]
   -fipa-struct-reorg          		
   -fipa-vrp                   		[disabled]
-  -fira-algorithm=            		CB
+  -fira-algorithm=[CB|priority] 	CB
   -fira-hoist-pressure        		[enabled]
   -fira-loop-pressure         		[disabled]
-  -fira-region=               		[default]
+  -fira-region=[one|all|mixed] 		[default]
   -fira-share-save-slots      		[enabled]
   -fira-share-spill-slots     		[enabled]
   -fira-verbose=<number>      		0x5
@@ -336,7 +336,7 @@
   -fregmove                   		
   -frename-registers          		[enabled]
   -freorder-blocks            		[disabled]
-  -freorder-blocks-algorithm= 		simple
+  -freorder-blocks-algorithm=[simple|stc] 	simple
   -freorder-blocks-and-partition 	[disabled]
   -freorder-functions         		[disabled]
   -freport-bug                		[disabled]
@@ -386,7 +386,7 @@
   -fshrink-wrap-separate      		[enabled]
   -fsignaling-nans            		[disabled]
   -fsigned-zeros              		[enabled]
-  -fsimd-cost-model=          		unlimited
+  -fsimd-cost-model=[unlimited|dynamic|cheap] 	unlimited
   -fsingle-precision-constant 		[disabled]
   -fsplit-ivs-in-unroller     		[enabled]
   -fsplit-loops               		[disabled]
@@ -404,7 +404,7 @@
   -fstack-protector-all       		[disabled]
   -fstack-protector-explicit  		[disabled]
   -fstack-protector-strong    		[disabled]
-  -fstack-reuse=              		all
+  -fstack-reuse=[all|named_vars|none] 	all
   -fstack-usage               		[disabled]
   -fstdarg-opt                		[enabled]
   -fstore-merging             		[disabled]
@@ -489,7 +489,7 @@
   -fvar-tracking-uninit       		[disabled]
   -fvariable-expansion-in-unroller 	[disabled]
   -fvect-cost-model           		
-  -fvect-cost-model=          		[default]
+  Specifies the cost model for vectorization. -fvect-cost-model=[unlimited|dynamic|cheap] 	[default]
   -fverbose-asm               		[disabled]
   -fversion                   		
   -fvisibility=[default|internal|hidden|protected] 	default

Ready to be installed after regression tests?
Thanks,
Martin
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