ParseHelper: assign global XfbBuffer to a block missing it

If a block has assigned a XfbOffset it is assumed that it would
inherit the current global XfbBuffer. This commit fixes two use cases:

1) Getting the members of a Block with a XfbOffset to be assigned an
   offset, as explained on GLSL 4.60 spec, section "4.4.2 Output
   Layout Qualifiers", subsection "Transform Feedback Layout
   Qualifiers".

2) Compute properly an error on overlapping ranges if a block is
   assigned a XfbOffset and one of it members is assigned a explicit
   one. This gets working because when the members of a block get
   assigned a Offset/Buffer at fixBlockXfbOffsets, then the block is
   deassigned the Offsets, so ranges are computed only with the block
   members.

BTW, this is already done when redeclaring block builtins.

Fixes #1535
diff --git a/Test/spv.xfbOverlapOffsetCheckWithBlockAndMember.vert b/Test/spv.xfbOverlapOffsetCheckWithBlockAndMember.vert
new file mode 100644
index 0000000..3f493dc
--- /dev/null
+++ b/Test/spv.xfbOverlapOffsetCheckWithBlockAndMember.vert
@@ -0,0 +1,19 @@
+#version 450
+
+/* block definition from GLSL spec 4.60, section 4.4.2, Output Layout Qualifiers */
+
+layout(location=5, xfb_buffer = 3, xfb_offset = 12) out block2 {
+   vec4 v; // v will be written to byte offsets 12 through 27 of buffer
+   float u; // u will be written to offset 28
+   layout(xfb_offset = 40) vec4 w;
+   vec4 x; // x will be written to offset 56, the next available offset
+};
+
+void main() {
+   v = vec4(1.0, 0.0, 1.0, 0.0);
+   u = 5.0;
+   w = vec4(1.0, 0.0, 0.0, 1.0);
+   x = vec4(5.0, 0.0, 0.0, 0.0);
+
+   gl_Position = vec4(0.0);
+}