IGA minor JSON fix

Fixes case for send messages where AddrType is INVALID (e.g. gateway EOT)

Author: trbauer

visa/iga/IGAJSON.md

@@ -130,8 +130,8 @@ indirect register used and may include `Rgn` (region) objects for regions used.
 Sources may include `Vt` and `Wi` if those fields are present
 (in some formats these are implicit fields).
 
-Send instructions have additional operands
-* `AD` address
-* `DA` data
-* `IM` immediate will be used for immediate send descriptors
-
+Send instructions have additional operand kinds:
+* `AD` address: an address type (possibly with surface info), an offset, payload size
+* `DA` data: a register an payload, and
+* `IM` immediate: for immediate send descriptors.
+The `-Xprint-ldst` option might impact operand layout.

visa/iga/IGALibrary/Frontend/FormatterJSON.cpp

@@ -700,6 +700,7 @@ class JSONFormatter: public BasicFormatter
     void emitAddrSurfInfo(const Instruction &i, const MessageInfo &mi) {
         emit("{\"type\":");
         switch (mi.addrType) {
+        case AddrType::INVALID: emit("\"invalid\""); break;
         case AddrType::FLAT: emit("\"flat\""); break;
         case AddrType::BTI:  emit("\"bti\""); break;
         case AddrType::BSS:  emit("\"bss\""); break;