tidy up the runtime API crate (#85)

- remove unused runtime API imports and constants
- move runtime api symbols into the revive-runtime-api crate

Signed-off-by: Cyrill Leutwiler <bigcyrill@hotmail.com>

crates/runtime-api/src/polkavm_imports.rs

@@ -10,6 +10,80 @@ use inkwell::{context::Context, memory_buffer::MemoryBuffer, module::Module, sup
 
 include!(concat!(env!("OUT_DIR"), "/polkavm_imports.rs"));
 
+pub static SBRK: &str = "__sbrk_internal";
+
+pub static MEMORY_SIZE: &str = "__msize";
+
+pub static ADDRESS: &str = "address";
+
+pub static BALANCE: &str = "balance";
+
+pub static BALANCE_OF: &str = "balance_of";
+
+pub static BLOCK_NUMBER: &str = "block_number";
+
+pub static CALL: &str = "call";
+
+pub static CALLER: &str = "caller";
+
+pub static CHAIN_ID: &str = "chain_id";
+
+pub static CODE_SIZE: &str = "code_size";
+
+pub static DEPOSIT_EVENT: &str = "deposit_event";
+
+pub static GET_IMMUTABLE_DATA: &str = "get_immutable_data";
+
+pub static GET_STORAGE: &str = "get_storage";
+
+pub static HASH_KECCAK_256: &str = "hash_keccak_256";
+
+pub static INPUT: &str = "input";
+
+pub static INSTANTIATE: &str = "instantiate";
+
+pub static NOW: &str = "now";
+
+pub static RETURN: &str = "seal_return";
+
+pub static SET_STORAGE: &str = "set_storage";
+
+pub static RETURNDATACOPY: &str = "return_data_copy";
+
+pub static RETURNDATASIZE: &str = "return_data_size";
+
+pub static SET_IMMUTABLE_DATA: &str = "set_immutable_data";
+
+pub static VALUE_TRANSFERRED: &str = "value_transferred";
+
+/// All imported runtime API symbols.
+/// Useful for configuring common attributes and linkage.
+pub static IMPORTS: [&str; 23] = [
+    SBRK,
+    MEMORY_SIZE,
+    ADDRESS,
+    BALANCE,
+    BALANCE_OF,
+    BLOCK_NUMBER,
+    CALL,
+    CALLER,
+    CHAIN_ID,
+    CODE_SIZE,
+    DEPOSIT_EVENT,
+    GET_IMMUTABLE_DATA,
+    GET_STORAGE,
+    HASH_KECCAK_256,
+    INPUT,
+    INSTANTIATE,
+    NOW,
+    RETURN,
+    RETURNDATACOPY,
+    RETURNDATASIZE,
+    SET_IMMUTABLE_DATA,
+    SET_STORAGE,
+    VALUE_TRANSFERRED,
+];
+
 /// Creates a LLVM module from the [BITCODE].
 /// The module imports `pallet-revive` runtime API functions.
 /// Returns `Error` if the bitcode fails to parse, which should never happen.