x86/xeddata: trim leading space in parsing

The new version of XED data file contains some comment lines with
a leading space, e.g. " # EOSZ=2 not64". The current parser doesn't
recognize it. Trim the leading space.

Change-Id: Ia5aa244aece7a1cee2d7842d69c60c9d5335dcce
Reviewed-on: https://go-review.googlesource.com/c/arch/+/655435
Reviewed-by: Austin Clements <austin@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

x86/xeddata/reader.go

diff --git a/x86/xeddata/reader.go b/x86/xeddata/reader.go
index fc8aa94..cd23510 100644
--- a/x86/xeddata/reader.go
+++ b/x86/xeddata/reader.go
@@ -113,6 +113,7 @@
 	)
 
 	for _, l := range lines {
+		l = strings.TrimLeft(l, " ")
 		if l[0] == '#' { // Skip comment lines.
 			continue
 		}

x86/xeddata/testdata/xed_objects.txt

diff --git a/x86/xeddata/testdata/xed_objects.txt b/x86/xeddata/testdata/xed_objects.txt
index 9d0c52e..c252acf 100644
--- a/x86/xeddata/testdata/xed_objects.txt
+++ b/x86/xeddata/testdata/xed_objects.txt
@@ -13,6 +13,7 @@
 # {
 # ICLASS : ADD
 # }
+ # comment with leading space
 ====
 []