reserve blocks for Valve extensions (KhronosGroup#566)

Author: zmike

include/spirv/spir-v.xml

@@ -141,13 +141,14 @@
     <ids type="opcode" start="6656" end="6719" vendor="Meta" comment="Contact [email protected]"/>
     <ids type="opcode" start="6720" end="6783" vendor="MediaTek" comment="Contact [email protected]"/>
     <ids type="opcode" start="6784" end="6911" vendor="Intel" comment="Contact [email protected]"/>
+    <ids type="opcode" start="6912" end="6975" vendor="Valve" comment="Contact [email protected]"/>
     <!-- Opcode enumerants to reserve for future use. To get a block, allocate
          multiples of 64 starting at the lowest available point in this
          block and add a corresponding <ids> tag immediately above. Make
          sure to fill in the vendor attribute, and preferably add a contact
          person/address in a comment attribute. -->
     <!-- Example new block: <ids type="opcode" start="XXXX" end="XXXX+64n-1" vendor="Add vendor" comment="Contact TBD"/> -->
-    <ids type="opcode" start="6912" end="65535" comment="Opcode range reservable for future use by vendors"/>
+    <ids type="opcode" start="6976" end="65535" comment="Opcode range reservable for future use by vendors"/>
     <!-- End reservations of opcodes -->
 
 
@@ -176,13 +177,14 @@
     <ids type="enumerant" start="6656" end="6719" vendor="Meta" comment="Contact [email protected]"/>
     <ids type="enumerant" start="6720" end="6783" vendor="MediaTek" comment="Contact [email protected]"/>
     <ids type="enumerant" start="6784" end="6911" vendor="Intel" comment="Contact [email protected]"/>
+    <ids type="enumerant" start="6912" end="6975" vendor="Valve" comment="Contact [email protected]"/>
     <!-- Enumerants to reserve for future use. To get a block, allocate
          multiples of 64 starting at the lowest available point in this
          block and add a corresponding <ids> tag immediately above. Make
          sure to fill in the vendor attribute, and preferably add a contact
          person/address in a comment attribute. -->
     <!-- Example new block: <ids type="enumerant" start="XXXX" end="XXXX+64n-1" vendor="Add vendor" comment="Contact TBD"/> -->
-    <ids type="enumerant" start="6912" end="4294967295" comment="Enumerant range reservable for future use by vendors"/>
+    <ids type="enumerant" start="6976" end="4294967295" comment="Enumerant range reservable for future use by vendors"/>
     <!-- End reservations of enumerants -->