Add llvm feature option to compile for Solana BPF target (#16495)

sdk/bpf/c/bpf.mk

@@ -44,6 +44,7 @@ BPF_C_FLAGS := \
   $(C_FLAGS) \
   -target bpf \
   -fPIC \
+  -march=bpfel+solana
 
 BPF_CXX_FLAGS := \
   $(CXX_FLAGS) \
@@ -53,6 +54,7 @@ BPF_CXX_FLAGS := \
   -fno-exceptions \
   -fno-asynchronous-unwind-tables \
   -fno-unwind-tables \
+  -march=bpfel+solana
 
 BPF_LLD_FLAGS := \
   -z notext \

sdk/bpf/scripts/install.sh

@@ -92,7 +92,7 @@ if [[ ! -e criterion-$version.md || ! -e criterion ]]; then
 fi
 
 # Install Rust-BPF
-version=v1.5
+version=v1.6
 if [[ ! -e bpf-tools-$version.md || ! -e bpf-tools ]]; then
   (
     set -e