ricv64: Update "Zbb" extension opcode comment. am: 81410830d5 am: a4305958cc

Original change: https://android-review.googlesource.com/c/platform/art/+/2967245

Change-Id: Ia9fe3a27a5393243dc08fbea358c443ffdb2a2a3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
diff --git a/compiler/utils/riscv64/assembler_riscv64.h b/compiler/utils/riscv64/assembler_riscv64.h
index 475acd8..193585b 100644
--- a/compiler/utils/riscv64/assembler_riscv64.h
+++ b/compiler/utils/riscv64/assembler_riscv64.h
@@ -500,7 +500,7 @@
   void Sh3AddUw(XRegister rd, XRegister rs1, XRegister rs2);
   void SlliUw(XRegister rd, XRegister rs1, int32_t shamt);
 
-  // "Zbb" Standard Extension, opcode = 0x13, 0x1b or 0x33, funct3 and funct7 varies.
+  // "Zbb" Standard Extension, opcode = 0x13, 0x1b, 0x33 or 0x3b, funct3 and funct7 varies.
   // Note: 32-bit sext.b, sext.h and zext.h from the Zbb extension are explicitly
   // prefixed with "Zbb" to differentiate them from the utility macros.
   void Andn(XRegister rd, XRegister rs1, XRegister rs2);